Hussain, Farrukh, et al. “Allelopathic Inhibition of Germination, Seedling Growth and Cell Division of Selected Plant Species by Calotropis Procera (Ait.) Ait”. Plant Science Today, vol. 7, no. 1, Jan. 2020, pp. 1-8, doi:10.14719/pst.2020.7.1.606.